Strapping tool

ABSTRACT

A strapping tool includes a main body, a strap winding device, and a strap cutting device. The main body is pivotally provided with a first engaging member. The strap winding device includes a spindle. The spindle is provided with a handle, a ratchet gear and a stopper. The handle is pivotally connected with a second engaging member and a push member. When the strapping tool is in a return state, the push member pushes the first engaging member so that the first engaging member disengages from the ratchet gear and the second engaging block leans against the stopper for the user to rotate the spindle freely so as to insert or remove a packing strap.

FIELD OF THE INVENTION

The present invention relates to a strapping tool.

BACKGROUND OF THE INVENTION

A packing strap is always used to pack goods through a manual strapping tool for transportation. A conventional strapping tool comprises a main body. The main body is provided with a cutting device, a strap winding device, and a strap pressing device. The strap winding device is provided with a handle. After the packing strap is wound around an article to be packed, one end of the packing strap is inserted through the strap pressing device, the other end of the packing strap is inserted through the cutting device and wound around the strap winding device, and then the packing strap is gradually tightened by the handle. Finally, the unnecessary packing strap is cut by the cutting device to complete the packaging operation.

When the packing strap is tightened by the handle, the packing strap exerts a counterforce on the strap winding device, causing the handle to be stuck and unable to rotate. In this situation, it is required to scissor the packing strap, and then the packing operation is performed again. When the strap winding device is wound with the excessive packing strap and the good is not tightened, the cutting device is used to cut the packing strap and then the packing operation is performed again. The conventional strapping tool cannot achieve the effect of quick packing. Accordingly, the inventor of the present invention has devoted himself based on his many years of practical experiences to solve these problems.

SUMMARY OF THE INVENTION

The primary object of the present invention is to provide a strapping tool which allows the user to freely rotate a spindle for a quick and effortless packing when in a return state.

In order to achieve the aforesaid object, the strapping tool of the present invention comprises a main body, a strap winding device, a strap cutting device, and a strap pressing device. The main body includes a press plate. The main body is pivotally provided with a first engaging member. The first engaging member includes a first engaging block and a press block. The strap winding device includes a spindle. The spindle is provided with a handle and a ratchet gear. The handle is pivotally connected with a second engaging member. The second engaging member includes a second engaging block. The handle is provided with a linking member and a push member. The strap winding device further includes a stopper. The strap cutting device includes a cutter shaft. The cutter shaft is provided with a cutter tube and a connecting block. The connecting block is connected with the linking member. The strap pressing device includes a strap pressing shaft. A first side of the strap pressing shaft is provided with a cam. A second side of the strap pressing shaft is provided with a strap pressing seat. The strap pressing seat is pivotally connected with a strap pressing block.

When the strapping tool of the present invention is in a return state, the push member pushes the press block so that the first engaging block disengages from the ratchet gear and the second engaging block leans against the stopper for the user to rotate the spindle freely so as to insert or remove a packing strap.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a perspective view of the present invention;

FIG. 2 is a partial exploded view of the present invention;

FIG. 3 is a schematic view of the present invention;

FIG. 4 is a schematic view of the present invention, showing that the ratchet gear can be rotated freely when the handle is in a return state;

FIG. 5 is a schematic view of the present invention, showing that the handle is operated to tighten the packing strap;

FIG. 6 is a schematic view of the present invention, showing that the first engaging member and the second engaging member engage with the ratchet gear;

FIG. 7 is a schematic view of the present invention, showing that the pull block is pulled;

FIG. 8 is a schematic view of the present invention, showing that the handle is pressed down;

FIG. 9 is a schematic view of the present invention, showing that the handle drives the spindle;

FIG. 10 is a schematic view of the present invention, showing that the handle drives the spindle to rotate;

FIG. 11 is a schematic view of the present invention, showing that the handle drives the spindle to return;

FIG. 12 is a schematic view of the present invention, showing that the spindle is returned to the initial position; and

FIG. 13 is a schematic view of the present invention, showing that the strap pressing seat, strap pressing block and the spindle are replaceable.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

Embodiments of the present invention will now be described, by way of example only, with reference to the accompanying drawings.

As shown in FIG. 1 and FIG. 2, the present invention discloses a strapping tool 100. The strapping tool 100 comprises a main body 10, a strap winding device 20, a strap cutting device 30, and a strap pressing device 40.

The main body 10 comprises a first frame 11 and a second frame 12. The first frame 11 is made of iron. The second frame 12 is made of aluminum. The first frame 11 is provided with a press plate 13. An angle is defined between a top surface and a bottom surface of the press plate 13, as shown in FIG. 3. The angle is in the range of 2-6 degrees. A pivot 14 is insertedly mounted in the second frame 12. The pivot 14 is provided with two first engaging members 141 and two springs 142. Two ends of each spring 142 leans against the second frame 12 and a corresponding one of the first engaging members 141, respectively. The two first engaging members 141 each include a first engaging block 143 and a press block 144. The first engaging blocks 143 of the two first engaging members 141 have different lengths, as shown in FIG. 10. A recess 145 is defined between the first engaging block 143 and the press block 144. The second frame 12 of the main body 10 is further provided with a positioning member 15. The positioning member 15 is a set screw.

The strap winding device 20 includes a spindle 21 insertedly mounted in the first frame 11 and the second frame 12. The spindle 21 is provided with a handle 22, a ratchet gear 23, a stopper 24, and an linking member 25. The handle 22 is made of aluminum. The handle 22 is pivotally connected with a second engaging member 221. The second engaging member 221 is pivotally connected to the handle 22 through a pin 222. An elastic member 223 is provided to lean against the handle 22 and the second engaging member 221. The second engaging member 221 includes a second engaging block 224 and a pull block 225. The pull block 225 extends out of the handle 22. The pull block 225 engages with the ratchet gear 23 in a normal state, as shown in FIG. 6. When the pull block 225 is pulled, the pull block 225 disengages from the ratchet gear 23, as shown in FIG. 7. The handle 22 is provided with a push member 226. The push member 226 is inserted through a push axle of the handle 22. When the handle 22 is in a return state, the push member 226 pushes the two press blocks 144 so that the two first engaging blocks 43 disengage from the ratchet gear 23, as shown in FIG. 4. When the handle 22 is pressed down, the push member 226 is located in the two recesses 145 so that the two first engaging blocks 143 disengage from the ratchet gear 23, as shown in FIG. 9. One end of the stopper 24 is secured to the second frame 12. The stopper 24 includes a stop block 241. The stop block 241 is located between the second engaging member 221 and the ratchet gear 23. When the handle 22 is in the return state, the second engaging member 221 leans against the stop block 241, as shown in FIG. 4. The handle 22 is provided with a linking pin 227. The linking pin 227 is connected with the linking member 25, such that the handle 22 can link the linking member 25 to turn. The linking member 25 includes a first lifting portion 251 and a first return portion 252. The first return portion 252 is an arc-shaped block.

The strap cutting device 30 includes a cutter shaft 31. The cutter shaft 31 is provided with a cutter tube 32 and a connecting block 33. The connecting block 33 includes a second lifting portion 331 and a second return portion 332 corresponding to the first lifting portion 251 and the first return portion 252. The second return portion 332 is an arc-shaped block.

The strap pressing device 40 includes a strap pressing shaft 41. The strap pressing shaft 41 is insertedly mounted in the first frame 11 and the second frame 12. A first side of the strap pressing shaft 41 is provided with a cam 42 and an elastic member 43. The cam 42 is provided with an extension rod 421. The extension rod 421 is pivotally provided with a roller 422. Two ends of the elastic member 43 lean against the first frame 11 and the cam 42, respectively. A second side of the strap pressing shaft 41 is integrally provided with an eccentric shaft 44. The eccentric shaft 44 extends out of the second frame 12. The eccentric shaft 44 is sleeved with an elastic member 45 and a strap pressing seat 46. Two ends of the elastic member 45 lean against the first frame 11 and the strap pressing seat 46, respectively. The strap pressing seat 46 has a mounting hole 461 therein, and is mounted to the eccentric shaft 44 through a mounting member 462. The strap pressing seat 46 is provided with a pivot shaft 463. The pivot shaft 463 is insertedly mounted in the strap pressing seat 46 and pivotally connected with a strap pressing block 47. The strap pressing seat 46 is provided with an elastic member 464 at one side of the pivot shaft 463. The elastic member 464 is a compression spring. The other end of the elastic member 464 is pushed against the strap pressing block 47, as shown in FIG. 3.

In this present embodiment of the present invention, only the elastic member 464 is a compression spring, and the other elastic members are torsion springs.

Referring to FIG. 3, when the strapping tool 100 of the present invention is used to pack an article 200 with a packing strap 201, the handle 22 is pressed down to drive the cam 42 to turn via the roller 422 in cooperation with the extension rod 421. The strap pressing shaft 41 is rotated to rotate the eccentric shaft 44 synchronously, thereby lifting the strap pressing seat 46 and the strap pressing block 47. As shown in FIG. 9, the packing strap 201 is inserted into the gap between the strap pressing block 47 and the press plate 13 by the user, and then the handle 22 is released to lean against the roller 422 so that the handle 22 is returned to press the packing strap 201.

Then, the free end of the packing strap 201 passes through the cutter shaft 31 and the spindle 21. When the handle 22 is returned, referring to FIG. 4, the push member 226 pushes the two press blocks 144 so that the two first engaging blocks 143 disengage from the ratchet gear 23, and the second engaging block 224 leans against the stop block 241 so that the second engaging block 224 disengages from the ratchet gear 23, allowing the user to freely rotate the spindle 21 so that the packing strap 201 can be easily inserted and secured.

Referring to FIG. 5 and FIG. 6, when the handle 22 is lifted up, the second engaging block 224 engages with the ratchet gear 23 to drive the ratchet gear 23 to rotate the spindle 21 and to roll the packing strap 201. When the handle 22 is pulled back, the two first engaging blocks 143 engage with the ratchet gear 23. The two first engaging blocks 143 have different lengths to engage with the ratchet gear 23 surely, preventing the ratchet gear 23 from reversing. Thereby, the handle 22 is repeatedly operated to tighten the packing strap 201.

Referring to FIG. 7, when the packing strap 20 is tightened to a certain degree and the handle 22 cannot be rotated, for example, the position of the handle 22 is not easy to exert a force or the counterforce of the packing strap 201 causes the second engaging member 221 to be stuck with the ratchet gear 23, the user can pull the pull block 225 to disengage the second engaging block 224 from the ratchet gear 23, such that the user can freely adjust the angle of the handle 22 to apply a force for further tightening the packing strap 201. In addition, when the spindle 21 is wound with the excessive packing strap 201 and the article is not tightened, the user can operate the handle 22 to be in the return state, so that the two first engaging blocks 143 and the second engaging block 224 disengage from the ratchet gear 23 for the user to rotate the spindle 21 freely to loosen the packing strap 201. The forgoing packing step is operated again to tighten the packing strap 201.

Referring to FIG. 8, FIG. 9, and FIG. 10, finally, the handle 22 is pressed down, enabling the first lifting portion 251 to get contact with the second lifting portion 331 to rotate the cutter shaft 31 so as to cut the packing strap 201. Meanwhile, the push member 226 is in the two recesses 145 so that the two first engaging blocks 143 disengage from the ratchet gear 23, and the second engaging block 224 leans against the stop block 241 so that the second engaging block 224 disengages from the ratchet gear 23 for the spindle 21 to be rotated freely to remove the packing strap 201. The cam 42 is pressed down by the handle 22 to lift the strap pressing seat 46 and the strap pressing block 47 to release the strap pressing state so that the packing operation is completed. As shown in FIG. 11 and FIG. 12, the user may lift the handle 22 up for the first return portion 252 to get contact with the second return portion 332 in a tangential state. Finally, when the cutter shaft 31 leans against the positioning member 15, the cutter shaft 31 is turned back to the initial position.

It is worth mentioning that through the extension rod 421 and the eccentric shaft 44, the handle 22 can be rotated for a small angle to lift the strap pressing seat 46 and the strap pressing block 47. When the strap pressing device 40 is operated to press the packing strap, the elastic member 464 enables the strap pressing block 47 to press the packing strap 201 and the press plate 13. The angle a defined between the top surface and the bottom surface of the press plate 13 enables the strap winding device 20 to pull the packing strap 201. Therefore, the packing strap 201 is pulled to move rearward and the strap pressing block 47 is driven to press the packing strap 201 and the press plate 13, thereby enhancing the pressing capacity. The angle is in the range of 2-6 degrees, so that the strapping tool can be used for different thicknesses of packing straps.

Referring to FIG. 13, the mounting member 462 can be disassembled from the strap pressing device 40 by a wrench to replace the strap pressing seat 46 and the strap pressing block 47 quickly, alternatively, the pivot shaft 463 is removed manually to replace the strap pressing block 47 quickly. Thereby, the strapping tool can be used for different types of packing straps. Furthermore, the cutter shaft 31 may be in a half moon shape to improve the cutting efficiency.

The spindle 21 and the strap pressing shaft 41 are insertedly mounted in the first frame 11 and the second frame 12 to position and secure the first frame 11 and the second frame 12. The first frame 11 is made of iron, so that it can withstand the force generated during the packing process. The second frame 12 and the handle 22 are made of aluminum, so that the weight can be reduced and the strapping tool can be operated conveniently.

Although particular embodiments of the present invention have been described in detail for purposes of illustration, various modifications and enhancements may be made without departing from the spirit and scope of the present invention. Accordingly, the present invention is not to be limited except as by the appended claims. 

What is claimed is:
 1. A strapping tool, comprising: a main body, including a press plate, the main body being pivotally provided with a first engaging member, the first engaging member including a first engaging block and a press block; a strap winding device, including a spindle, the spindle being provided with a handle and a ratchet gear, the handle being pivotally connected with a second engaging member, the second engaging member including a second engaging block, the handle being provided with a linking member and a push member, the strap winding device further including a stopper; a strap cutting device, including a cutter shaft, the cutter shaft being provided with a cutter tube and a connecting block, the connecting block being connected with the linking member; and a strap pressing device, including a strap pressing shaft, a first side of the strap pressing shaft being provided with a cam, a second side of the strap pressing shaft being provided with a strap pressing seat, the strap pressing seat being pivotally connected with a strap pressing block.
 2. The strapping tool as claimed in claim 1, wherein the main body is further provided with a positioning member, the handle is provided with a linking pin connected with the linking member so that the handle can link the linking member to turn, the linking member includes a first lifting portion and a first return portion, the first return portion is an arc-shaped block, the connecting block includes a second lifting portion and a second return portion corresponding to the first lifting portion and the first return portion, and the second return portion is an arc-shaped block.
 3. The strapping tool as claimed in claim 1, wherein the second engaging member is provided with an elastic member to lean against the handle and the second engaging member respectively, the second engaging member further includes a pull block, and the pull block extends out of the handle.
 4. The strapping tool as claimed in claim 1, wherein a recess is defined between the first engaging block and the press block.
 5. The strapping tool as claimed in claim 1, wherein the main body is pivotally provided with two first engaging members, the two first engaging members each include the first engaging block and the press block, and the first engaging blocks of the two first engaging members have different lengths.
 6. The strapping tool as claimed in claim 1, wherein the stopper includes a stop block, the stop block is located between the second engaging member and the ratchet gear, when the handle is in a return state, the second engaging member leans against the stop block.
 7. The strapping tool as claimed in claim 1, wherein the main body includes a first frame and a second frame, the first frame is made of iron, the second frame and the handle are made of aluminum, and the spindle and the strap pressing shaft are insertedly mounted in the first frame and the second frame.
 8. The strapping tool as claimed in claim 1, wherein the cam is provided with an extension rod, the extension rod is pivotally provided with a roller, the second side of the strap pressing shaft is integrally provided with an eccentric shaft, the eccentric shaft extends out of the main body, and the eccentric shaft is sleeved with the strap pressing seat.
 9. The strapping tool as claimed in claim 8, wherein the strap pressing seat has a mounting hole therein and is mounted to the eccentric shaft through a mounting member, the strap pressing seat is provided with a pivot shaft, the pivot shaft is insertedly mounted in the strap pressing seat and pivotally connected with the strap pressing block, the strap pressing seat is provided with an elastic member at one side of the pivot shaft, the elastic member is a compression spring, and another end of the elastic member is pushed against the strap pressing block.
 10. The strapping tool as claimed in claim 1, wherein an angle is defined between a top surface and a bottom surface of the press plate, and the angle is in the range of 2-6 degrees. 